Essential oil diffuser



FIG. 1 is a front view of an essential oil diffuser;

FIG. 2 is a rear view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a side view thereof;

FIG. 6 is a front left top perspective view thereof; and,

FIG. 7 is a rear right bottom perspective view thereof.

The broken lines are for the purpose of illustration and form no part of the claimed design. 

CLAIM The ornamental design for an essential oil diffuser, as shown and described. 